Magazine gun



(No Model.) 3 sheetssheen 1.

' vK. KRNKA.

MAGAZINE GUN. No. 442,058. Patented Dec. 2, 1890.

KARL KEA/Kn,

Luv anto 3554144 Hihzrney 2 t nu e h S w e e h s 3 .m MG E NN KA .M KM

(No Model.)

Patented Deo. 2, 1890.

nA, ww R MK Im. MW M 3 Sheets-Shea?J 3. KKR-NRA, MAGAZINE GUN.

(No Model.)

.Patented Dec. 2, 1890.

IIIIIII'IIIIIII I 0519666 vf'.- di W@ Nrrnn STATES erica.

Armar KARL KRNKA, OF LONDON, ENGLAND, ASSIGNOR TO THE KRNKA REPEAT- ING RIFLE COMPANY, OF SAME PLACE.

MAGAZINE-GUN.

SPECIFICATION forming part of Letters Patent No. 442,058, dated December 2, 1890.

Application tiled January 25, 1890. Serial No. 338,162. [No model.)

To @ZZ whom t may concern.-

Be it known that I, KARL KRNKA, a resident of London, England, and a subject of the Emperor of Austria, have invented an Improvement in Magazine Fire-Arms, ot' which the following is a specification.

My invention relates to improvements in magazine tire-arms of the type already patented in the United States to Silvester Krnka and-myself under No. 386,638, on the 24th of J nl v, 1888, and for which further Letters Patent were applied for by us under Serial No. 299,789, on the 13th day of February, 1889.

The general action of loading and firing this riiie and the principles of action of the breech-bolt are the same as described in the specication forming part of the aforesaid patent and application for patent; and the present invention consists in modifications of detail to obtain lighter weight and more perfectand reliable action of the parts and to cheapen the price of manufacture.

In order that mvv present invention may be the better understood, I now proceed to describe the same in relation tothe drawings hereunto annexed, reference being had to the letters marked thereon.

Figure 1 is a sectional elevation of the rifle with the breech open. Fig. 2 is a transverse section on the line @c Fig. 1, with the breech closed. Fig. 8 is an elevation of the shoe and shoe-plate. Fig. 4 is a transverse section on the line yy ly, Fig. 3. Fig. 5 is a plan on the top of the shoe. Fig. (i is a plan ot' the shoeplate. Fig. 7 is an elevation of the breechbolt removed. Fig. 7 is a'view of the under side ot' the breech-bolt. Fig. 8 is a sectional plan of the closed breech, showing the breechbolt and cartridge-loosener extractor. Fig. 9 is a view of the firing-pin detached. Fig. 10 represents two views of the breech-bolt screw detached. Fig. 11 is a sectional view of the breech-bolt engaged with the sear. Fig. 12 is` a view of the tiring-pin volute spring. Fig. 13 is a view ot the breech-bolt handle detached. Fig. 14: is a view of the trigger detached. Fig. 15 represents two views of the scar detached. Fig. 1G represents two views of the spring-flap. Fig.17 is a sectional plan of the open breech, as shown in Fig. i. Fig. 18 is a sectional elevation showing the breech open, as in Fig. 1, and slightly modified; and Fig. 19 is a like view showing the breech closed.

Vith regard to improvements in the shoey stock of the gun, the shoe E is made in a single piece, guiding the actionot the breechbolt. A shoe-plate E is attached under the stock for the reception of t-he magazine and trigger-guard and carrying the trigger apparatus.

Fig. 3 shows the shoe E, in combinar ion with the shoe-plate E', connected by the breechscrew q and the shoe-plate screw q. The breech-screw q passes through a plain hole in the shoe-plate E', entering into a tapped holey in the trigger-guard I, which when screwed home thus holds the shoe-plate E iu place. In the breech-bolt B both locking-ribs b2 are coincident in position at the end of the bolt. A circular groove e in the shoe E is now made of sufficient diameter to allow of the two locking-ribs b2 rotating in this groove without friction. Further, 'a lixed screw e', Figs. 3 and 4, is tapped into the wall of the shoe and projects into the circular groove into which the locking-ribs are pushed through suitable side slots to admit them. The end-of the said screw c is prepared so as to present a diagonal face to the end of the locking-ribs b2, and serves to produce a first rotary movement of the breech bolt when the latter is forced home. A cartridgebridge c2, Figs. 1 and 5, is left in the shoe E at the forward edge of the magazine, which enables the cartridge as it is pushed from the magazine to enter into the breech of the rifle. This takes the place of the spring-tongue described in the specification ofsaid application Serial No. 299,789 as attached to the front ofthe spring flaps or gills, and offers the advantage that the breech-bolt nose b4 does not constantly wear against the bridge, which is now provided with a central groove or slot in which the breech-bolt nose can en ter, and permits a considerable width to the breech-bolt nose.

Thelongitudinal under slot Ui of the breechbolt is provided with a recessed groove on its inner face, in which engages a nose g5 of the scar. (Shown engaged together at Fig. Il.) 'lhis arrangement is designed to prevent the premature firing of the rifle effected by pulling down the sear accidentally by the trigger. As a consequence of this arrangement, 1 he sear cannotbe disengaged from thebreechbolt until the breech is absolutely closed, the engaging lip being at that point cut away. A further advantage, also obtained, is that when the breech is fully opened and the bolt withdrawn it is prevented from falling out of the shoe by its iixed engagement with thc sear, which cannot be removed by accident; but when the scar is withdrawn from engagement with the breech-bolt at the proper place, where the ridge is cut away, the breech-boltl can be withdrawn from the shoe without the loosening' of any screw if the trigger is then 'continually pressed. The position of the helical slot b of the breech-bolt has been changed to suit the altered position of the bolt-handle A, the engaging pin a of the handle-socket being formed as a continuation of the said handle A within the socket, Fig. 13, to engage in the said helical slot.

Now I apply a modified extractor F, Figs. l, 8, I7, and 19, which is attached rigidly at its back end to or is part of a socket f, and projects entirely beyond the body of the breech-bolt, the clip end being capable of elastic spring on the bolt sufficient for the nose of the extractor to litt over and engage `with the flange of the cartridge. rlhis arrangement is much stronger than the one formerly patented, and the friction. which formerly existed between the elastic part of the old extractor and the breech-bolt shoe is removed. The breech-bolt, in its rotary niotion, turns within the sockctf, clearance being allowed in the extractor for the rotation of the bolt-lugs h2. Thus the extractor does not turn with the bolt, but, Ventering a suita'ble slot in the shoe, acts as a guide for the handle A, which engages into the socketf of the extractor. This facilitates the opening of the breech at'ter firing. The helical slots b in the breech-bolt and c in the breech-screw C, Fig. l0, terminate in a recess in the outermost ends of the slots, in which Vengages the little pin a of the handle A. \Vhen, then, the breech-bolt is opened, its-motion is first rotary, on account of the backward motion of the handle A and its pin a', traveling in the said helical slots. 'hen, however, the handle has been pulled back so far that the pin a is drawn back to the backward end of thc boltscrew C, the breech-bolt B has not yet finished its rotary motion; butwhen the handle of the boltisdrawnback farther,thebreeclrbolt ends its rotation by means ofthe oblique faces ofthe two shoulders es e8, Fig. 25, to the rear of the locking-chamber c. The back ends 4ot' the two lockingribs @zare pressed back, rotating the breech-bolt by their disengagement from the oblique faces of the said shoulders. The handle A, therefore, by its little pin a enface of the screw c', the bolt so far being pressed home without rotation by the direct thrust of the pin a against the shoulder of the slot.

rlhe extractor-socket f is provided with a slot to permit the travel of the pin a longitudinally within the said socket. A similar rotative motion of the breech-bolt B takes place at the closing of the breech independent of the driving effect of the little pin a in the helical slots b and c. The pin a is thus released from the shoulder-notch, and, passing down the helical slot, completes thelocking of the bolt in the locking-chamber.

rlhe improved cartridge-extractor has the further advantage that, during the repeating firing from the magazine, it catches each cartridge as soon as the saine leaves the magazine, so that the cartridges are prevented from meeting each other during fire. The helical slot remains always covered bythe improved cartridge-extractor.

rlhe improved cartridge-extractor may be removed from the breech like the other parts wit-hout the use of any special appliances.

I apply a cartridge-starting apparatus, as in Figs. l, S, and 17, in order to start ajammcd cartridge from the breech before the dead pull of the breech-bolt comes upon it by the beforementioned extractor F. The .nose of the extractor F in this case leaves a small space-such as one-sixteenth of an inch-between itself and the inner face of the cartridge-flange. I tit a lever R in a slot through the side or other part of the breech-chamber E, pivoted upon a pin r, so placed that the distance from the pivct yr to the foot of the projection o" is double the length of the nose r2, which rests against the cartridge-flange. lVhen the cartridge is home, as shown in Figs. S and 19, the breech-bolt B is rotated by the action of the helical slot b and the handlepin a. before there is any longitudinal motion of the breech-bolt. As the breech-bolt is then withdrawn, a further rotation is caused by the locking-ribs lf2 striking against the inclincs es. This further rotation and the straight pull longitudinal motion of the brceclrbolt forces one of the locking-ribs b2 under the projection fr of the lever R, thus causing the said lever to rotate on its pivot r and ejecting the cartridge a short distance by the nose r2 of the said lever. After this the nose of the extractor F will have passed through its clearance and have seized hold of the flange of the cartridge to complete the withdrawal of the exploded cartridge-casc by the IOS IZO

longitudinal travel of the bolt. Should, then, the exploded cartridge-case be jammed, the ii rst starting motion effected by the lever-R is done under great mechanical advantage from the part rotating and part longitudinal motion of the breech-holt through a short distance before the ordinary extractor F completes the withdrawal. I may place this starting-lever at either side or underneath the breech-chamber. In the latter case the starti'ng-levermay be operated by the nose b4 of the breech-bolt. Yhen the cartridge-starter is arranged in other positions than that shown, a second oblique-faced screw e is used, as in Fig. 1S.

In the improved firing-pin D, Fig. 9, instead of the former hollow collar, I construct upon it the short full collar d2, and where the space for the tiring-pin spring is small I use a conical volute spring of thin steel ribbon d', Fig. 1i. The improved trigger-guard I is no longer elastic, as before, to release the magazine, but is now supplied with an independent catch i, Figs. 1, 1S, and 1i), which is capable of longitudinal motion in a corresponding recess of the trigger-guard I. A small catchspring t" presses the catch continuously forward against the magazine, so that the latter finds the necessary support on this catch z'. The downward arm of this catch fr' has two steps t2 z3, Fig. 1. Then the lower step is pressed backward to the front of the triggerguard, by applying a finger to said step z3 the magazine is released only as regards the lower catch 724. This permits the dropping of the magazine to permit of single firing by the insertion of single cartridges from the top of the breech. \\"hen, however, it is desired to drop the magazine entirely it is only necessary to press the finger against the higher step i2 until the finger is stopped by the front of the trigger-guard, when the magazine is entirely released an d disengages and falls out. This, however, can only be effected by the complete pull-back of the said catch in one movement, as in the intermediate position of single firing the catch z` is locked so as to prevent accidental dropping of the magazine from that position. This is effected by the interlocking of the notch in thetop of the catch with the overhanging lower end of the top catch on the lowered magazine, when said catch is only partially retracted as above. The forward movement of this catch is limited by an upright pin in the cylindrical part which engages in a corresponding groove c7,

Fig. G, in the shoe-plate E.

The trigger-spring g', Figs. 1, i8, and 1S), is here shown as distinct from the trigger-guard to facilitate manufacture. This spring is screwed to the mechanism at the same time as the trigger-guard I, by means of the breechscrew q. In order to put this mechanism together, the trigger-guard I is hooked with the hook on its front end into the slot e5 in the shoe-plate E', the trigger-sprin g g being at the same time inserted through the slot c3 in the said shoe-plate. On screwing up the breechscrcw q, which can be done by hand, everything is then secured in place. The shoeplate E is removed and fixed in thc` samc manner by thc removal or tightening of' the breech-screw q. 'lheshoe-plate screw q need not be removed, as it merely forms a fixed shoulder over which the front end of the shoeplate E may be inserted and readily removed upon taking ont the breech-screw q. The gills or fiaps J, Fig. 16, are tixedin place by three studs j j upon the shoe-plate; butl these gills need not be removed for cleaning except together with the shoe-plate. In my improved magazine, Figs. 1,18, and 19, the follower h5 is now confined by the two guides 7b2 hthe former h2 being a recess to receive lthe heel 7L of the follower, and the latter r3 being a corrugation in each side of the. case, forming a guide for a suitable recess in the follower. The follower has its heel h6 turned down, so that. when the magazine is exhausted the said heel checks any further movement of the breech-bolt as it rises to the top of its travel until checked by the elastic lugs 7L of the magazine. A project-ing pin upon the follower hi" engages into the topmost spiral of the magazine-spring to keep it in place, the said spring lying in a suitable recess in the bottom of the magazine to present the action in the required direction.

To prevent excessive stiffness of the elastic lugs h of the magazine, they have slot-s terminating at bottom in circular perforations at their front and back ends.

On the front of the magazine is a small plate extending on either side beyond the walls of the magazine for the purpose of facilitating correct and quick insertion into the rifle.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, isy 1. In a repeating-rifle, the combination, with a rotating breech-bolt having laterallyprojecting locking-ribs atits front end, of a breech-shoe having a recess to receive said ribs and provided with a fixed screw or screws c', having oblique-faced inner ends projecting into said recess, substantially as shown and described.

2. In a repeatingrifle, the combination, witha rotating breech-bolt having` laterallyprojecting locking-ribs at. its front end, of a breech-shoe having a recess to receive said ribs, grooves leading thereto, means for reci procating and rotating the bolt, including inclines es within the breech-shoe, and a starting-lever R,.pivoted to said shoe and acted on by a projection on said bolt during its rotation preliminary to its direct retraction, sub7 stantially as described.

3. In arepeating-rifie, the combination, with the breech-bolt, of a cartridge-extractor and socket carrying the bolt-handle and projecting from the body of the bolt and sliding in a slot in the shoe to act as a guide to the bolt-handle independent of the rotary mo- IOO tion of the breech-bolt, substantially as described.

4. In a repeating-rifle, the sear g, con* strueted with a groove or lip engaging' in a eorrespondin g lip or groove within the breechboltI to prevent the accidental lowering or disengagement o'l the sear, except in a predetermined position where the said engaging lip or grooveis eut away, substantially as described.

5. In a repeating-rile, the combination, with a gravitating magazine II, having double catches ,714, projecting rearwardly different distances, of the forwardly-projecting magazine-catch i, having the two finger-steps 2 i3, a springvl, which normally projects said catch i into the path of said double Catches h4, and a trigger-guard I, the front of which eonstitutes a stop for the finger applied to either of said linger-steps and is located a given disrance behind said finger-step i3 and a greater distance behind said finger-step 2, substantially as shown and described, for dropping the magazine for single tiring or so as to detach the magazine at will, vin the manner set forth.

6. In a repeating-rifle, the Combination, with the one-part breech-shoe E and the shoeplate E', of the permanent shoe-plate screw q passing through the stock and tapped into said breech-shoe near its front end and engaged by the front end of said shoe-plate, and the removable breech-shoe screw q, extending through and uniting the rear ends of said breeehshoe and shoe-plate, substantially as shown and described.

In testimony whereofI have sign ed my name to this specification in the presence of two subscribing witnesses.

KARL KRNKA.

Witnesses:

RICHARD A. HOFFMANN, ALBERT E. NASH. 

